Abstract
We studied photoluminescence‐excitation (PLE) spectra of one‐dimensional (1D) electron systems in an n‐type modulation‐doped single quantum wire at various temperatures from 5K to 50K. At low temperature (5K), we observed a single absorption onset, which corresponds to the Fermi edge of degenerate 1D electron gas. As the temperature was increased, this Fermi‐edge absorption onset disappeared, while another absorption onset appeared at lower energy, which became a sharp peak at 50K. We assigned this peak to the 1D band‐edge absorption induced by the inverse square root divergence of 1D density of states (DOS).
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